所列化合物酸性最强的为（） <p> A. </p><img src="https://static.zxtiku.com/wangke/imgs/topic/fc86bbc0a9bfdd5dc46ac5bb743c39af.jpg"/> <p> B. </p><img src="https://static.zxtiku.com/wangke/imgs/topic/320771a6f1d7ecaa2f76ed15c5c7bbe7.jpg"/> <p> C. </p><img src="https://static.zxtiku.com/wangke/imgs/topic/992282c012b31ff49dbfb3fb3a7f9b0e.jpg"/> <p> D. </p><img src="https://static.zxtiku.com/wangke/imgs/topic/06069b75910d6477bd8ec60d714e8d70.jpg"/>